<template>
  <div class="list" ref="wrapper">
    <div>
      <div class="area">
        <div class="title border-topbottom"></div>
        <div class="button-list">
          <div class="button-wrapper">
            <div class="button">{{this.currentCity}}</div>
          </div>
        </div>
      </div>
      <div class="area">
        <div class="title border-topbottom">热门城市</div>
        <div class="button-list">
          <div class="button-wrapper" v-for="item in hotCitys" :key="item.id">
            <div class="button" @click="handleCityClick(item.name)">{{item.name}}</div>
          </div>
        </div>
      </div>
      <div class="area" v-for="(value,key) in citys" :key="key" :ref="key">
        <div class="title border-topbottom">{{key}}</div>
        <div class="item-list" v-for="item in value" :key="item.id">
          <div class="item border-bottom" @click="handleCityClick(item.name)">{{item.name}}</div>
        </div>
      </div>
    </div>
  </div>
</template>

<script>
import Bscroll from 'better-scroll'
import { mapState, mapMutations } from 'vuex'
export default {
  name: 'CityList',
  props: {
    hotCitys: Array,
    citys: Object,
    letter: String
  },
  watch: {
    letter () {
      if (this.letter) {
        const element = this.$refs[this.letter][0]
        this.scroll.scrollToElement(element)
      }
    }
  },
  computed: { // 状态映射，替代this.$store.state.city为this.currentCity，将两者通过计算属性进行了捆绑
    ...mapState({
      currentCity: 'city'
    })
  },
  methods: {
    handleCityClick (name) {
      this.changeCity(name) // mutation函数式映射
      // this.$store.dispatch('changeCity', name)
      this.$router.push('/') // 编程式路由
    },
    ...mapMutations(['changeCity'])
  },
  mounted () {
    this.scroll = new Bscroll(this.$refs.wrapper, {
      click: true
    })
  }
}
</script>

<style lang='stylus' scoped>
@import '~styles/varibles.styl'
.border
  &:before
    border-color #ccc
  &:after
    border-color #ccc
.border-bottom
  &:before
    border-color #ccc
.list
  overflow hidden
  position absolute
  top 1.58rem
  left 0
  right 0
  bottom 0
  .title
    line-height 0.54rem
    background #eee
    padding-left 0.2rem
    color #666
    font-size 0.26rem
  .button-list
    overflow hidden
    padding 0.1rem 0.6rem 0.1rem 0.1rem
    font-size 0.32rem
    .button-wrapper
      width 33.33%
      float left
    .button
      margin 0.1rem
      text-align center
      border 0.02rem solid #ccc
      padding 0.1rem 0
      border-radius 0.06rem
  .item-list
    .item
      line-height 0.76rem
      color #666
      padding-left 0.2rem
</style>
